Improvement in direct-acting engines



RDBANB DIREOT ACTING ENGINE.

No 102,234. BatentedApr. 26, 1870.

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OHARLESP. DEANE, OF SPRINGFIELD, MASSACHUSETTS.

Letters Patent N 0. 102,234, dated April 6, 1870.

IMPROVEMENT IN DIRECT-ACTING ENGINES.

The Schedule referred to in these Letters Patent and making part of the same.

v tion of a separate secondary valvemoved mechanically by the engine, the certainty and promptness of the 0p-, eration of said main valve are further insured by moving it also mechanically, by power from the engine, whenever, by reason of any sticking of said motivepiston or other cause, it shall fail to be moved with sufficient promptness by the steam let onto it, as aforesaid.

I will now describe my invention, referring to the accompanying drawings, in which- 4 Figure 1 is a section of myimproved engine, showing the arrangement of the valves.

Figures 2 and 3are detail views, showing one of the valves and the arrangement of its ports A is the main piston of the engine.

B, the cylinder.

1n the valve-chest G I arrange the main slide-valve G and the secondary slide-valve. D, which is operated by the valve-rod a and the tappet-arm b, which is at-' tached to the pistonrod E.

Above the valve-chest A l arrange the motive-piston F, working in its cylinder H, and attached to the main slide-valve O by the connection I. f

The main .ports 1, 2, 3 are similar in arrangement to those of ordinary engines.

The main slide-valve C is an ordinary B-valve.

1 construct the secondary valve 1), as, shown, in two parts, a and (I, connected together, so that the said valve can be arranged around the main valve 0, and in the same chest, the part 0 being arranged. to operate the motive-piston F in one direction, and ithe part (I to operate the same in the opposite direction.

The arrangement of the ports x, y, and z to operate the 1notive-piston in one direction, I will now describe.

a: is the port which communicates between the end e of the cylinder Hand the exhaust-port y, when the valve D is in the position shown.

5 is the induction-port to let in steam to the end f of the cylinder H at the same time.

The port y communicates with themain exhaust 3.

The end c of the port it enters the cylinder H at a short distance from the end, for the purpose of cushioning the piston F.

The operation of this invention is as follows:

The piston A is supposed to be moving in the direction indicated by the arrow, the valve 0 having been brought into position to effect this by the action of the tappet-arm b on the valve D, bringing it into the position shown in fig. 2, so that steam passes through :1 to the end fof cylinder H, and is exhausted from end 0 by means of ports a: and y, thus giving the requisite motion to motive-piston F, carrying slide valve 0. If, however, from any cause, the motivepiston F should fail to be moved promptly in the manner described, it will be moved by means of the tappet-a-rm b, in connection with the secondary valve 1), by power derived from the main pistol The opposite half of the valve 1) has ports arranged in a similar but reversed manner to the half above described, and produces a motion of the "motive-piston in the opposite direction.

I claim- 1. The contingent mechanical connection of motivepiston F, carrying main slide-valve O, with a separate secondary slide-valve D, or its rod a, whereby said motive-piston is moved mechanically by power from the engine, when not 'moved with sntficient promptness by the previous action of the secondary valve.

2. The arrangement of the valve 0 and double valve D in the same chest, substantially as shown.

3. The manner of operating the motive-piston 1 by the valve D, constructed and having ports arranged substantially as shown.

Witnesses:

D. M. WnLLs, J. B. GARDINER.

CHARLES P. DEANE. 

